Remove systemd socket env vars to not fail other systemd compatible daemons launched inside butterfly

butterfly.server.py

@@ -228,6 +228,10 @@ http_server.listen(port, address=host)
 url = "http%s://%s:%d/*" % (
     "s" if not tornado.options.options.unsecure else "", host, port)
 
+if http_server.systemd:
+    os.environ.pop('LISTEN_PID')
+    os.environ.pop('LISTEN_FDS')
+
 # This is for debugging purpose
 try:
     from wsreload.client import sporadic_reload, watch

butterfly/__init__.py

@@ -14,7 +14,7 @@
 #
 # You should have received a copy of the GNU General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
-__version__ = '1.5.5'
+__version__ = '1.5.6'
 
 
 import os